—You must be very excited about going to England for further study.
— , but I am afraid I won’t do well because my English is poor.
| A．I’m sorry | B．Certainly not |
| C．I don’t know yet | D．Well, I ought to be |
There are several chemical factories ______ waste water into the river.
A. pours B. pour C. pouring
Jim has been to the Great Wall before, ______ he?
A. has B. does C. hasn’t
The city has improved a lot _________ I came here a few years ago.
A. sinceB. forC. when
The weather in summer here is cooler than ______ in Beijing.
A. this B. that C. it
In our class, about ______ of the students are girls.
A. three fifths B. third fifth C. third fifths